---Someone is knocking at the door. Who may it be?
---It ______ be Tom. He is still in the school.
A.can’t | B.mustn’t |
C.couldn’t | D.may not |
---Someone is knocking at the door. Who may it be?
---It ______ be Tom. He is still in the school.
A.can’t | B.mustn’t |
C.couldn’t | D.may not |